My plants have been rained on for the past two days, almost non stop!
However, they are under cover, albeit a temporary effort, but it will keep them from wet leaves.
Wet leaves for more than a day or two, will make plants vulnerable to fungal disease … the dreaded “tomato blight” which cannot be cured – only controlled.
My outside plants are all under cover of some kind … it may not look very pretty but it works.
Get some plastic sheeting and with a few garden pegs you have a temporary cover, and hopefully tomatoes too in a few weeks time.
If you suspect that your plants have tomato blight, please follow this link tomato blight.